This tiny river island switches sovereignty every six months as part of a rare, centuries-old agreement.

The fading, forgotten remains of a once bright and booming factory.

A market built atop boats is one of the few floating holiday markets in Europe.

The building features one of the last remaining free-floating spiral grand staircases in the U.S.

This supper-club-turned-concert-venue still serves drinks at its original rotating bar.

The ruins of an abandoned church mingle with the graves at Oaxaca’s General Cemetery.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

This magnificent church allows travelers along one of Germany's busiest roadways a chance to rest and reflect.

Each winter this underground cave forms a dazzling ice palace.

This giant boulder is sandwiched between apartment complexes in upper Manhattan.

This medieval church is the only one in the world that features all Marc Chagall stained-glass windows.

A well preserved medieval fortress in Vojvodina.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

Nestled between a college and a golf course, the garden is home to more than 2,500 rhododendrons.

The highway's southernmost spot is a beloved local attraction.

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

The main gates have been locked since 1745 and will remain so until the Stuart Dynasty returns to the throne.

The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

A historic holy well hidden near a charming English park.

Originally slated to become a luxurious resort, this structure is now a graffiti haunt reclaimed by nature.

Known as the "Hobbit Houses," these storybook homes look like they're straight out of the Shire.

Its tremendous toad is actually a five-story museum and viewing platform.

An out-of-place grove of sequoias thrives in northern Spain.

A painfully obvious spy house sits right across the street from the Russian Embassy.